Introduction To Rdbms Oodbms And Ordbms Information Technology Essay

Introduction To Rdbms Oodbms And Ordbms Information Technology Essay The relational model is based on the structure of a database. A database is simply a collection of one or more relations or tables with columns and rows. The use of set theory allows for data to be structured in a series of tables that has both columns and rows. Each column corresponds to an attribute of that relation, while each row corresponds to a record that contains data values for an entity. The main elements of RDBMS are based on Ted Codds 13 rules for a  relational system, the concept of relational integrity, and normalization. The three fundamentals of a relational database are that all information must be held in the form of a table, where all data are described using data values. The second fundamental is that each value found in the table columns does not repeat. The final fundamental is the use of Standard Query Language (SQL). Benefits of RDBMS are that the system is simple, flexible, and productive. Because  the tables are simple, data is easier to understand and communicate with others. RDBMS are flexible because users do not have to use predefined keys to input information. Also,  RDBMS are more productive because SQL is easier to learn. This allows users to spend more time  inputting instead of learning. More importantly, RDBMSs biggest  advantage is the ease with which users can  create and access data and extend it if needed. After the original database is created, new data categories can be added without the existing application being changed. There are limitations to the relational database management system. First, relational databases do not have enough storage area to handle data such as images, digital and audio/video. The system was originally created to handle the integration of media, traditional fielded data, and templates. Another limitation of the relational database is its inadequacy to operate with languages outside of SQL. After its original development, languages such as C++ and JavaScript were formed. However, relational databases do not work efficiently with these languages. A third limitation is the requirement that information must be in tables where relationships between entities are defined by values. Today, the relational model is the dominant data model as well as the foundation for the leading DBMS products, which include IBMs DB2 family, Informix, Oracle, Sybase, Microsofts Access and SQLServer, as well as FoxBase and Paradox. RDBMS represent close to a multibillion-dollar industry alone. To combat the limitations of RDBMS and meet the challenge of the increasing rise of the Internet and the Web, programmers developed object-oriented databases in the 1980s. The main objective of Object-Oriented Database Management Systems, commonly known as OODBMS, is to provide consistent, data independent, secure, controlled and extensible data management services to support the object-oriented model. They were created to  handle big and complex data that relational databases could not. There are important characteristics involved with object-oriented databases. The most important characteristic is the joining of object-oriented programming with database technology, which provides an integrated application development system. Object-oriented programming results in 4 main characteristics:  inheritances, data encapsulation, object identity, and polymorphism. Inheritance allows one to develop solutions to complex problems incrementally by defining new objects in terms of previously defined objects. Data encapsulation or simply encapsulation allows the hiding of the internal state of the objects. Encapsulated objects are those objects that can only be assessed by their methods instead of their internal states. There are three types of encapsulated objects users and developers should recognize. The first is full encapsulation, in which all the operations on objects are done through message sending and method execution. The second is write encapsulation, which is where the internal state of the object is visible only for reading operations. The third is partial encapsulation, which involves allowing direct access for reading and writing for only a part of the internal state. Object identity allows objects of the database to be independent of each other. Polymorphism and dynamic binding allow one to define operations for one object and then to share the specification of the operation with other objects. This allows users and/or programmers to compose objects to provide solutions without having to write code that is specific to each object. The language important to OODBMS is data definition and manipulation language (DDML). The use of this language allows persistent data to be created, updated, deleted, or retrieved. An OODBMS needs a computational versus a relational language because it can be used to avoid impedance mismatch. DDML allows users to define a database, including creating, altering, and dropping tables and establishing constraints. DDMLs are used to maintain and query a database, including updating, inserting, modifying, and querying data. The OODBMS has many advantages and benefits. First, object-oriented is a more natural way of thinking. Second, the defined operations of these types of systems are not dependent on the particular database application running at a given moment. Third, the data types of object-oriented databases can be extended to support complex data such as images, digital and audio/video, along with other multi-media operations. Different benefits of OODBMS are its reusability, stability, and reliability. Another benefit of OODBMS is that relationships are represented explicitly, often supporting both navigational and associative access to information. This translates to improvement in data access performance versus the relational model. Another important benefit is that users are allowed to define their own methods of access to data and how it will be represented or manipulated. The most significant benefit of the OODBMS is that these databases have extended into areas not known by the RDBMS. Medicine, multimedia, and high-energy physics are just a few of the new industries relying on object-oriented databases. As with the relational database method, object-oriented databases also has disadvantages or limitations. One disadvantage of OODBMS is that it lacks a common data model. There is also no current standard, since it is still considered to be in the development stages. Object-oriented database technology is a marriage of object-oriented programming and database technologies. Figure 1 illustrates how these programming and database concepts have come together to provide what we now call object-oriented databases. Introduction to RDBMS OODBMS and ORDBMS Perhaps the most significant characteristic of object-oriented database technology is that it combines object-oriented programming with database technology to provide an integrated application development system. There are many advantages to including the definition of operations with the definition of data. First, the defined operations apply ubiquitously and are not dependent on the particular database application running at the moment. Second, the data types can be extended to support complex data such as multi-media by defining new object classes that have operations to support the new kinds of information. Other strengths of object-oriented modeling are well known. For example, inheritance allows one to develop solutions to complex problems incrementally by defining new objects in terms of previously defined objects. Polymorphism and dynamic binding allow one to define operations for one object and then to share the specification of the operation with other objects. These objects can further extend this operation to provide behaviors that are unique to those objects. Dynamic binding determines at runtime which of these operations is actually executed, depending on the class of the object requested to perform the operation. Polymorphism and dynamic binding are powerful object-oriented features that allow one to compose objects to provide solutions without having to write code that is specific to each object. All of these capabilities come together synergistically to provide significant productivity advantages to database application developers. A significant difference between object-oriented databases and relational databases is that object-oriented databases represent relationships explicitly, supporting both navigational and associative access to information. As the complexity of interrelationships between information within the database increases, so do the  advantages of representing relationships explicitly. Another benefit of using explicit relationships is the improvement in data access performance over relational value-based relationships. A unique characteristic of objects is that they have an identity that is independent of the state of the object. For example, if one has a car object and we remodel the car and change its appearance, the engine, the transmission, and the tires so that it looks entirely different, it would still be recognized as the same object we had originally. Within an object-oriented database, one can always ask the question, is this the same object I had previously?, assuming one remembers the objects identity. Object-identity allows objects to be related as well as shared within a distributed computing network. All of these advantages point to the application of object-oriented databases to information management problems that are characterized by the need to manage: a large number of different data types,   a large number of relationships between the objects, and   objects with complex behaviors. Application areas where this kind of complexity exists includes engineering, manufacturing, simulations, office automation and large information systems. Object-Relational database (ORDBMS) is the third type of database common today. ORDBMS are systems that attempt to extend relational database systems with the functionality necessary to support a broader class of applications and, in many ways, provide a bridge between the relational and object-oriented paradigms. ORDBMS was created to handle new types of data such as audio, video, and image files that relational databases were not equipped to handle. In addition, its development was the result of increased usage of object-oriented programming languages, and a large mismatch between these and the DBMS software. One advantage of ORDBMS is that it allows organizations to continue using their existing systems, without having to make major changes. A second advantage is that it allows users and programmers to start using object-oriented systems in parallel. There are challenges in implementing an ORDBMS. The first is storage and access methods. The second is query processing, and the third is query optimization. Since the development of RDBMS, OODBMS, and ORDBMS, many vendors have extended their systems with the ability to store new data types such as images and texts, and with the ability to ask more complex queries. One rising technique is enterprise resource planning and management resource planning, which add another layer of application-oriented features on top of a DBMS. Included applications come from  Baan, Oracle, SAP, and Siebel. These programs each identify a set of common tasks encountered by a large number of organizations and provide a general application layer to carry out these tasks. More importantly, DBMS have advanced into the Internet and Web Age.  Stored data is widely being accessed through a Web browser. Today, queries are being generated through Web-accessible forms and answers are being formatted using a mark-up language such as HTML. In addition, many vendors and distributors are adding features to their DBMS aimed at making it better equipped for Internet usage. In summary, relational and object-oriented database systems each have certain strengths as well as certain weaknesses. In general, the weakness of one type of system tends to be strength of the other. à ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦. Object Relational Database Management  System  (ORDBMS) is a DBMS or Database Management System akin to a relational database, but with an object oriented database model that allows  custom web development  professionals to combine the database with custom data types. It bridges the gap between relational databases and Object-Oriented Database Management System (OODBMS).   Traditional RDBMS (Relational Database Management System) focused on the efficient management from a limited set of data-types. Object relational DBMS allows  web sites development  experts to combine their own data types and methods.   The limitations of RDBMS have led to the introduction of object-relational database management systems ORDBMS systems occurred in the early 1990s out of research. One of the most notable research projects, the Postgres introduced two products Illustra and Postgre SQL. The mid-1990s saw many commercial products appearing. These included Omniscience, UniSQL and Illustra 2.   Objectives of Object Relational Databases: To bridge the gap between object-relational mapping and conceptual data modeling techniques. To bridge the gap between object oriented modeling techniques (used in programming languages like C++, C# and  Java) and relational databases. Advantages of ORDBMS: Object Relational Database Management Systems ensures large storage capacity, which is an important part in web based  development The access speed is fairly quick. ORDBMSs have massive scalability. ORDBMSs boast excellent manipulation power of object databases. Supports object functionality by adding separate APIs and  server  subsystems Redesigns the database engine completely Supports rich data types by adding a new object-oriented layer. Apart from these benefits, an object relational database management system has some drawbacks. One of the major disadvantages is its incapability for high-speed internet applications. However, ORDBMSs are designed to manage large amounts of information, an important aspect in the  development of website. The IDC opines that the ORDBMS market has the potential to surpass the size of ODBMS in the next couple of years in web based development. Read more:  http://www.articlesbase.com/programming-articles/ordbms-or-objectrelational-database-management-system-objectives-and-advantages821908.html#ixzz1CUlv7OAH   Under Creative Commons License:  Attribution à ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦. An object relational database is also called an object relational database management system (ORDBMS). This system simply puts an object oriented front end on a relational database (RDBMS). When applications interface to this type of database, it will normally interface as though the data is stored as objects. However the system will convert the object information into data tables with rows and colums and handle the data the same as a relational database. Likewise, when the data is retrieved, it must be reassembled from simple data into complex objects. Performance Constraints Because the ORDBMS converts data between an object oriented format and RDBMS format, speed performance of the database is degraded substantially. This is due to the additional conversion work the database must do. ORDBMS Benefits The main benefit to this type of database lies in the fact that the software to convert the object data between a RDBMS format and object database format is provided. Therefore it is not necessary for programmers to write code to convert between the two formats and database access is easy from an object oriented computer language. à ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦ To define Object-Relational Database Management System (ORDBMS) it is enough to take simple equation: ORDBMS = ODBMS + RDBMS = (O + R) * DB * MS. On a logical level, an ORDBMS is the MS process methods applied for DB data structure, which is complied with O object and R relational concepts. The R relational concept in the context of DBMS is based on the relations in the form of two-dimensional tables of rows and columns. Transformation of queries into relational algebra is the main confirmation that affiliates a database with the relational model. It is prejudice to think that SQL2 language is a single and necessary criterion of RDBMS just as to think that Java is a single language of OO programming. Noteworthy feature of RDBMS is the possibility to process a large mass of the uniform n-element tuples (rows or records) quickly. All necessary for object representation is available in the object DBMS (ODBMS). Often the ODBMS is equated to the OODBMS, namely DBMS integrated with an Object-Oriented (OO) programming language like C++ and Java. The characteristic properties of ODBMS are 1)  complex data, 2)  type inheritance, and 3)  object behavior. These features will be considered below regarding the ORDBMS. à ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦ Complex data creation in most SQL ORDBMSs is based on preliminary schema definition via the user-defined type (UDT). The table remains a most clear form for representation of complex data in any ORDBMS. students id name course first last st031 Jane Hunter Economy Planning st072 Richard White Computers in Engineering The name attribute (or field or column) consists of the first and last attributes. The value of the course attribute is a set of Economy and Planning elements. Such structure is able, for example, for the Informix SQL (http://www-3.ibm.com/software/data/informix/pubs/library/index.html). CREATE ROW TYPE Student (      id CHAR(5),      name ROW (first VARCHAR(12), last VARCHAR(20)),      course SET (VARCHAR(128) NOT NULL)   );   CREATE TABLE students OF TYPE Student;   INSERT INTO students   VALUES (      st031,      ROW(Jane, Hunter),      SET(Economy, Planning)   );   INSERT INTO students   VALUES (      st072,      ROW(Richard, White),      SET(Computers in Engineering) ); Other SQL ORDBMS suggests other composite type constructors, for example VARRAY or ARRAY instead of the SET, and OBJECT instead of the ROW. Constructors of the simple built-in types, with limitations like CHAR(5), came from SQL2. Is it necessary to define schema before filling a database? Historically, the answer was canonical yes for two reasons. Firstly, the definition of database schema essentially helped to control the type of input data. Secondly, the data type limitation made possible the early DBMSs to organize data with maximal memory and processor efficiency. Nevertheless, development of database schema is a most laborious process. There are a lot of situations related with complex data when precise schema description is not necessary or unreasonably slows project development. Furthermore, both reasons for schema predefinition are no longer valid. Control of input data should be executed by supporting an input form, (e.g., via JavaScript on the Web client side). With the hardware advances in modern database systems, the influence of data type limitation on performance is practically insignificant. à ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦ An object-oriented database management system (OODBMS), sometimes shortened to  ODBMS  for  object database management system), is a database management system (DBMS) that supports the modelling and creation of data as  objects. This includes some kind of support for  classes of objects and the  inheritance  of class properties and  methods by subclasses and their objects. There is currently no widely agreed-upon standard for what constitutes an OODBMS, and OODBMS products are considered to be still in their infancy. In the meantime, the object-relational database management system (ORDBMS), the idea that object-oriented database concepts can be superimposed on relational databases, is more commonly encountered in available products. An object-oriented database interface standard is being developed by an industry group, the Object Data Management Group (ODMG). The Object Management Group (OMG) has already standardized an object-oriented data brokering interface betwee n systems in a network. In their influential paper,  The Object-Oriented Database Manifesto, Malcolm Atkinson and others define an OODBMS as follows: An object-oriented database system must satisfy two criteria: it should be a DBMS, and it should be an object-oriented system, i.e., to the extent possible, it should be consistent with the current crop of object-oriented programming languages. The first criterion translates into five features: persistence, secondary storage management, concurrency, recovery and an ad hoc query facility. The second one translates into eight features: complex objects, object identity, encapsulation, types or classes, inheritance, overriding combined with late binding, extensibility and computational completeness. à ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦.. http://www.versant.com/en_US/products/oodbms.html/ OODBMS (OBJECT DATABASE) ADVANTAGES Using an  OODBMS  /  ODBMS  (object database management system, object-oriented data management system) for data storage brings powerful advantages to applications that use complex object models, have high concurrency requirements, and large data sets. It is difficult, time consuming, expensive in development, and expensive at run time, to map the objects into a relational database and performance can suffer. Versantsobject database  solutions (ODBMS) are designed to handle the navigational access, seamless data distribution, and scalability often required by these applications: Versant Object Database  OODBMS  (Java,  C++) FastObjects .NET  OODBMS  (.NET) Why Versants  OODBMS  solutions instead of traditional RDBMS? Where data handling requirements are simple and suitable to rigid row and column structures an RDBMS might be an appropriate solutiuon. However,for many applications, todays most challenging aspect is controlling the inherent complexity of the subject matter itself the complexity must be tamed. And tamed in a way that enables continual evolution of the application as the environment and needs change. For these applications, an  OODBMS  is the best answer: COMPLEX (INTER-) RELATIONSHIPS If there are a lot of many-to-many relationships, tree structures or network (graph) structures then Versants  OODBMS  solutions will handle those relationships much faster than a relational database. COMPLEX DATA For many applications, the most challenging aspect is controlling the inherent complexity of the subject matter itself the complexity must be tamed. For these applications, a Versant  OODBMS  is the best answer. Architectures that mix technical needs such as persistence (and SQL) with the domain model are an invitation to disaster. Versants  OODBMS  solutions let you develop using objects that need only contain the domain behaviour, freeing you from persistence concerns. NO MAPPING LAYER It is difficult, time consuming, expensive in development, and expensive at run time, to map the objects into a relational database and performance can suffer. VersantsOODBMS  solutions store objects as objects yes, its as easy as 1, 2, 3. Versants object database solutions are designed to store many-to-many, tree and network relationships as named bi-directional associations without having the need for JOIN tables. Hence, Versants object database solutions save programming time, and objects can be stored and retrieved faster. Modern O/R mapping tools may simplify many mapping problems, however they dont provide seamless data distribution or the performance of Versants  OODBMS  solutions. FAST AND EASY DEVELOPEMENT, ABILITY TO COPE WITH CONTINOUS EVOLUTION The complexity of telecommunications infrastructure, transportation networks, simulations, financial instruments and other domains must be tamed. And tamed in a way that enables continual evolution of the application as the environment and needs change. Architectures that mix technical needs such as persistence (and SQL) with the domain model are an invitation to disaster. Versants  OODBMSsolutions let you develop using objects that need only contain the domain behaviour, freeing you from persistence concerns.

How does Dickens present his views on education in hard times? :: Free Essay Writer

How does Dickens present his views on education in hard times? Hard times is set in the 1840’s in the North of England. It’s set at a time when Britain is changing dramatically because of the Industrial Revolution, which is mainly affecting this part of Britain. This revolution moved much of the work from the country into towns and cities, and small cramped villages were built around the factories and mills to house the workers. Dickens novel ‘hard times’ was set during this time. Dickens uses many techniques throughout the novel to show his views on education to his readers, the first of which is to create different characters, some of which contrast each other in different ways . Two of such Characters are Sissy Jupe and Bitzer. They differ in the ways they have been taught and the ways they see the education system. Bitzer is a model student, he has always strictly followed the system and been taught exactly how the system requires him to be taught. He is shown as lifeless and colourless, ‘the boy was so light-eyed and light-haired that the self-same rays appeared to draw out of him what little colour he ever possessed.’ This gives the effect that he has been drained of life and everything else but facts. When asked, Bitzer describes a Horse as a ‘Quadruped’ and ‘graminivorous’ and gives endless facts about the animal. Although this description is very factual and impressive, the use of long complex words and the amount of facts show that he has simply been taught these facts, and probably has never even seen a Horse. Sissy on the other hand does not understand how to factually define a Horse when asked, this is because she has been brought up with Horses all her life and they are too familiar and important to her just to be described in facts. This is one way that Dickens tries to show to his audience that this type of education is wrong, the teaching of bare facts limits the imagination of the student and a more practical way of teaching, like Sissy has had, would help the children understand the facts that they are being taught, instead of just learning them. Dickens also shows the characters of some of the staff at the school to make his views known. Mr Gradgrind is the first to be introduced, from the onset Dickens portrays him as ‘squared’ , both in his appearance and character, he reveals little about him apart from the fact he is rigid, and has little individuality. This is emphasized by the repletion of ‘square’ and ‘speaker’, and by this he is shown to

Deception Point Page 110

Sexton had no idea what the man was talking about. The reporter handed him the photocopies. Sexton looked at the pages-and for a moment, his mind went totally blank. No words came. He was staring at unfamiliar photographs. Black-and-white images. Two people. Naked. Arms and legs intertwined. For an instant, Sexton had no idea what he was looking at. Then it registered. A cannonball to the gut. In horror, Sexton's head snapped up to the crowd. They were laughing now. Half of them were already phoning in the story to their news desks. Sexton felt a tap on his shoulder. In a daze, he wheeled. Rachel was standing there. â€Å"We tried to stop you,† she said. â€Å"We gave you every chance.† A woman stood beside her. Sexton was trembling as his eyes moved to the woman at Rachel's side. She was the reporter in the cashmere coat and mohair beret-the woman who had knocked over his envelopes. Sexton saw her face, and his blood turned to ice. Gabrielle's dark eyes seemed to bore right through him as she reached down and opened her coat to reveal a stack of white envelopes tucked neatly beneath her arm. 132 The Oval Office was dark, lit only by the soft glow of the brass lamp on President Herney's desk. Gabrielle Ashe held her chin high as she stood before the President. Outside the window behind him, dusk was gathering on the west lawn. â€Å"I hear you're leaving us,† Herney said, sounding disappointed. Gabrielle nodded. Although the President had graciously offered her indefinite sanctuary inside the White House away from the press, Gabrielle preferred not to ride out this particular storm by hiding out in the eye. She wanted to be as far away as possible. At least for a while. Herney gazed across his desk at her, looking impressed. â€Å"The choice you made this morning, Gabrielle†¦ † He paused, as if at a loss for words. His eyes were simple and clear-nothing compared to the deep, enigmatic pools that had once drawn Gabrielle to Sedgewick Sexton. And yet, even in the backdrop of this powerful place, Gabrielle saw true kindness in his gaze, an honor and dignity she would not soon forget. â€Å"I did it for me, too,† Gabrielle finally said. Herney nodded. â€Å"I owe you my thanks all the same.† He stood, motioning for her to follow him into the hall. â€Å"I was actually hoping you'd stick around long enough that I could offer you a post on my budgeting staff.† Gabrielle gave him a dubious look. â€Å"Stop spending and start mending?† He chuckled. â€Å"Something like that.† â€Å"I think we both know, sir, that I'm more of a liability to you at the moment than an asset.† Herney shrugged. â€Å"Give it a few months. It will all blow over. Plenty of great men and women have endured similar situations and gone on to greatness.† He winked. â€Å"A few of them were even U.S. presidents.† Gabrielle knew he was right. Unemployed for only hours, Gabrielle had already turned down two other job offers today-one from Yolanda Cole at ABC, and the other from St. Martin's Press, who had offered her an obscene advance if she would publish a tell-all biography. No thanks. As Gabrielle and the President moved down the hallway, Gabrielle thought of the pictures of herself that were now being splashed across televisions. The damage to the country could have been worse, she told herself. Much worse. Gabrielle, after going to ABC to retrieve the photos and borrow Yolanda Cole's press pass, had snuck back to Sexton's office to assemble the duplicate envelopes. While inside, she had also printed copies of the donation checks in Sexton's computer. After the confrontation at the Washington Monument, Gabrielle had handed copies of the checks to the dumbstruck Senator Sexton and made her demands. Give the President a chance to announce his meteorite mistake, or the rest of this data goes public too. Senator Sexton took one look at the stack of financial evidence, locked himself in his limousine, and drove off. He had not been heard from since. Now, as the President and Gabrielle arrived at the backstage door of the Briefing Room, Gabrielle could hear the waiting throngs beyond. For the second time in twenty-four hours, the world was assembled to hear a special presidential broadcast. â€Å"What are you going to tell them?† Gabrielle asked. Herney sighed, his expression remarkably calm. â€Å"Over the years, I've learned one thing over and over†¦ † He put a hand on her shoulder and smiled. â€Å"There's just no substitute for the truth.† Gabrielle was filled with an unexpected pride as she watched him stride toward the stage. Zach Herney was on his way to admit the biggest mistake of his life, and oddly, he had never looked more presidential. 133 When Rachel awoke, the room was dark. A clock glowed 10:14 P.M. The bed was not her own. For several moments, she lay motionless, wondering where she was. Slowly, it all started coming back†¦ the megaplume†¦ this morning at the Washington Monument†¦ the President's invitation to stay at the White House. I'm at the White House, Rachel realized. I slept here all day. The Coast Guard chopper, at the President's command, had transported an exhausted Michael Tolland, Corky Marlinson, and Rachel Sexton from the Washington Monument to the White House, where they had been fed a sumptuous breakfast, been seen to by doctors, and been offered any of the building's fourteen bedrooms in which to recuperate. All of them had accepted. Rachel could not believe she had slept this long. Turning on the television, she was stunned to see that President Herney had already completed his press conference. Rachel and the others had offered to stand beside him when he announced the meteorite disappointment to the world. We all made the mistake together. But Herney had insisted on shouldering the burden alone. â€Å"Sadly,† one political analyst on TV was saying, â€Å"it seems NASA has discovered no signs of life from space after all. This marks the second time this decade that NASA has incorrectly classified a meteorite as showing signs of extraterrestrial life. This time, however, a number of highly respected civilians were also among those fooled.† â€Å"Normally,† a second analyst chimed in, â€Å"I would have to say that a deception of the magnitude the President described this evening would be devastating for his career†¦ and yet, considering the developments this morning at the Washington Monument, I would have to say Zach Herney's chances of taking the presidency look better than ever.† The first analyst nodded. â€Å"So, no life in space, but no life in Senator Sexton's campaign either. And now, as new information surfaces suggesting deep financial troubles plaguing the senator-â€Å" A knock on the door drew Rachel's attention. Michael, she hoped, quickly turning off the television. She hadn't seen him since breakfast. On their arrival at the White House, Rachel had wanted nothing more than to fall asleep in his arms. Although she could tell Michael felt the same, Corky had intervened, parking himself on Tolland's bed and exuberantly telling and retelling his story about urinating on himself and saving the day. Finally, utterly exhausted, Rachel and Tolland had given up, heading for separate bedrooms to sleep. Now, walking toward the door, Rachel checked herself in the mirror, amused to see how ridiculously she was dressed. All she had found to wear to bed was an old Penn State football jersey in the dresser. It draped down to her knees like a nightshirt. The knocking continued. Rachel opened the door, disappointed to see a female U.S. Secret Service agent. She was fit and cute, wearing a blue blazer. â€Å"Ms. Sexton, the gentleman in the Lincoln Bedroom heard your television. He asked me to tell you that as long as you're already awake†¦ † She paused, arching her eyebrows, clearly no stranger to night games on the upper floors of the White House.

The Important of Teachers Guidance in Education - 1360 Words

Carl Jung once said, â€Å"One looks back with appreciation to the brilliant teachers, but with gratitude to those who touched our human feelings. The curriculum is so much necessary raw material, but warmth is the vital element for the growing plant for the soul of the child.† (Jung) Children are born ready to learn and are anxious to know everything about anything. Learning and developing these concepts helps build the foundation for the rest of your life. However as a little child you thrive from human relationships and you learn from what teachers, parents and other adults around you are doing. Positive role models will influence the child positively where as negative relationships will influence the child negatively. This is why early†¦show more content†¦You must successfully master the steps in order from one to eight in order to obtain development, according to Erikson. Level one is, Trust vs. Mistrust. This stage is during you life between the ages of birth a nd two years old. These young children are unsure of everything, and have not grasped their world yet. These infants look to their caregivers for guidance and a sense of assurance. This stage of life is so vital for life, it is so important for caregivers to give these infants the touching, loving attention they so desperately crave. The second stage of the chain of development is Autonomy vs. Shame and Doubt. This happens during early childhood, and this stage is all about control and choices. Children during these ages are becoming their own little people and are becoming more independent. It is important for educators and caregivers to acknowledge this independent and let it happen, but in a controlled environment. Stage three is Initiative vs. Guilt. Children between the ages of 3 and 5 children are definitely more independent and it shows. During this age children are in school, and interacting with other children at school, daily. Where they will be picking up on other childre n’s attitudes, manners and habits. It is important for parents and teachers to realize this and keep relationships at a healthy level. Industry vs. Inferiority, or level four is during the late elementary school, early middle school age.Show MoreRelatedInterview And Questions On Teaching Students Essay1282 Words   |  6 Pagesinterview two or three educational professionals in the field. I was to ask them questions created by myself, that I deemed important to my learning of teaching students with exceptionalities. My field interview and questions took place with Ms. Argenio, special education teacher, Mr. Butler, coordinator of school counseling services, and Mrs. Ciampi, secondary education school counselor. The first section of this paper will discuss the similar responses between the interviewees. 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